不同分子结构疏水缔合聚合物复配体系性能评价与机理研究

发布时间：2018-04-04 09:02

本文选题：疏水改性聚丙烯酰胺　切入点：复合体系　出处：《西南石油大学》2015年硕士论文

【摘要】：疏水改性聚丙烯酰胺(HMPAM)因其具有良好的粘弹性和抗剪切性能,在聚合物驱提高采收率领域具有广阔的应用前景。然而,在高温、高矿化度等苛刻的油藏环境条件下,聚合物驱油剂有效黏度大幅度下降。针对这一问题,本文通过将不同分子结构的HMPAM混合,得到两种具有显著协同效应的复合体系,并进一步研究影响协同效应的因素,最后通过流变性和荧光光谱法探讨协同效应的机理。本文主要研究内容如下： (1)通过热聚合法,以丙烯酰胺(AM)和十六烷基二甲基烯丙基氯化铵(C16DMAAC)为原料合成共聚物AM/C16DMAAC,经后水解得到三种疏水基团含量分别为0.2mo1%、0.5mo1%、1mol%的疏水改性聚丙烯酰胺P(AM/NaAA/C,6DMAAC)——PA系列；以AM、75%的甲基丙烯酰氧乙基三甲基氯化铵(DMC)和C16DMAAC为原料,合成三种阳离子度分别为1.0mol%、3.0mol%、5.0mol%的疏水改性聚丙烯酰胺P(AM/DMC/C16DMAAC)——PB系列；通过光聚合法,以AM和2-丙烯酰胺基十四烷基磺酸钠(NaAMC14S)为原料合成共聚物AM/NaAMC14S,经后水解得到三种疏水基团含量分别为0.05mo1%、0.10mol%、0.15mol%的疏水改性聚丙烯酰胺P(AM/NaAA/NaAMC14S)——PC系列。通过红外光谱(FT-IR)和核磁共振氢谱(1H-NMR)分别对聚合物PA、PB和PC的结构进行表征,证实合成的聚合物为目标聚合物。采用0.2mo1/L的氯化钠、50%体积的甲酰胺作溶剂测定不同HMPAM的特性黏数,并计算出分子量。 (2)将聚合物PA与PB进行复配,研究复配比、阳离子度、矿化度、聚合物浓度、温度、剪切速率对PA与PB之间协同增黏效应的影响规律。通过流变性测试研究聚合物PA与PB之间协同效应机理,发现复合体系网络结构交联点的密度和强度都高于单一聚合物溶液；通过荧光光谱法研究聚合物PA与PB之间协同效应机理,发现复合体系的疏水微区数量高于单一聚合物溶液,说明复合体系网络结构变得更强和更加致密是聚合物之间产生协同效应的原因。 (3)将聚合物PA与PC进行复配,通过考察复配比、疏水单体C16DMAAC含量、疏水单体NaAMC14S含量、矿化度、聚合物浓度、温度、剪切速率对PA与PC之间协同增黏效应的影响规律。通过流变性测试研究聚合物PA与PC之间协同效应机理,发现复合体系网络结构交联点的密度和强度都高于单一聚合物溶液；通过荧光光谱法研究聚合物PA与PC之间协同效应机理,发现复合体系的疏水微区数量高于单一聚合物溶液,说明复合体系网络结构变得更强和更加致密是聚合物之间产生协同效应的原因。 (4)以平板夹砂物理模型为平台,将复合体系和单一聚合物溶液的驱油效率进行对比,结果表明复合体系的驱油效率高出单一聚合物溶液至少近10%,最高达到30%,证明了复合体系具有实际应用价值。
[Abstract]:Hydrophobically modified polyacrylamide ( HMPAM ) has a wide application prospect in the field of polymer flooding recovery because of its good viscoelasticity and shear resistance . However , under severe reservoir environmental conditions such as high temperature and high salinity , the effective viscosity of polymer flooding agent is greatly reduced . In view of this problem , two kinds of composite systems with significant synergistic effect are obtained by mixing HMPAM with different molecular structures . Finally , the mechanism of synergistic effect is discussed by rheology and fluorescence spectrometry . The main contents of this paper are as follows :

( 1 ) The copolymer AM / C16DMAAC was synthesized from acrylamide ( AM ) and cetyl dimethyl allyl ammonium chloride ( C16DMAAC ) by a thermal polymerization method . Three kinds of hydrophobic modified polyacrylamide P ( AM / NaAA / C , 6DMAAC ) _ PA series were obtained by hydrolysis .
The hydrophobic modified polyacrylamide P ( AM / DMC / C16DMAAC ) PB series was prepared by AM , 75 % methacryloyloxyethyl trimethyl ammonium chloride ( DMC ) and C16DMAAC as raw materials .
The copolymer AM / NaAMC14S was synthesized by light polymerization with AM and 2 - acrylamidotetradecyl sulfonate ( NaAMC14S ) . The structures of polymer PA , PB and PC were characterized by IR ( FT - IR ) and 1H - NMR , respectively .

( 2 ) The effects of compounding ratio , cation degree , mineralization degree , polymer concentration , temperature and shear rate on the synergistic adhesion between PA and PB were studied by compounding the polymer PA with PB . The mechanism of synergistic effect between PA and PB was studied by rheological tests .
The mechanism of synergistic effect between polymer PA and PB was studied by fluorescence spectrometry . It was found that the hydrophobic micro - area of composite system was higher than that of single polymer solution , and it was suggested that the network structure of composite system became stronger and more compact is the cause of synergistic effect between polymer .

( 3 ) The polymer PA and PC were compounded . The effect of the synergistic effect between PA and PC was studied by investigating the synergistic effect between PA and PC by investigating the synergistic effect between PA and PC through rheological tests .
The mechanism of synergistic effect between polymer PA and PC was studied by fluorescence spectrometry . It was found that the hydrophobic micro - area of composite system was higher than that of single polymer solution . It was suggested that the network structure of composite system became stronger and more compact is the cause of synergistic effect between polymer .

( 4 ) The oil displacement efficiency of the composite system and single polymer solution is compared with that of single polymer solution . The results show that the oil displacement efficiency of the composite system is at least nearly 10 % higher than that of the single polymer solution , up to 30 % , which proves that the composite system has practical application value .

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.46

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